Granted Patent
Utility
US 5,512,521 · App. 08/401,597
Cobalt-free, black, dual purpose porcelain enamel glass
Inventors:
Dechun Fu, Vernon J. Grebe
Patented Case
View Patent ↗
Granted: Apr 30, 1996
Filed: Mar 9, 1995
Inventors
Dechun Fu
Vernon J. Grebe
Assignee (at issue)
Bayer Aktiengesellschaft
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.